Fujinon Corporation

Fujifilm Corporation

Fuji Photo Optical Co., Ltd.

Laurel Precision Machines Co., Ltd.

Nanchang O-film Optical-electronic Tech Co., Ltd.

Masao Mori

Yu Kitahara

Toshiaki Katsuma

Tetsuya Ori

Ryoko Otomo

Hiromitsu Yamakawa

Yoko Yamamoto

Makoto Oomura

Masaru Amano

Yukiko Nagatoshi

Taro Asami

Kazuyoshi Okada

Masataka Takahashi

Naofumi Mirumachi

Kuniaki Ono

A projection lens having an optical system includes: an incidence lens on which light from an electrooptic element is incident; and an emission lens positioned closest to a magnification side and emits an image toward a projection surface, in which an incidence optical axis of the incidence lens is shifted in a first direction orthogonal to the incidence optical axis with respect to a center of a screen of the electrooptic element, a projection angle, which is an angle of an emission optical axis of the emission lens with respect to the projection surface, is less than 90°, and assuming an effective diameter of the emission lens is DE, a focal length of an entire optical system including the emission lens is f, and a half angle of view of the entire optical system is ω, ω is ≥60°, and a value of PA defined by Expression (1)≥0.1 and ≥7. PA=DE/(f×tan ω) (1).

Projection lens and projection apparatus

The imaging lens includes at least one positive lens that satisfies predetermined conditional expressions (1) to (3) indicating conditions in which dispersion is relatively low and refractive index is high while having a negative rate of change of the refractive index. In a case where a lens that satisfies a conditional expression (4) meaning a low dispersion material is included, the lens that satisfies the conditional expression (4) satisfies a predetermined conditional expression (5).

Imaging lens and optical apparatus

An imaging lens is constituted by, in order from the object side to the image side: a negative first lens having a concave surface toward the image side; a positive second lens having a convex surface toward the image side; a negative third lens having a concave surface toward the image side; a positive biconvex fourth lens; a positive biconvex fifth lens; and a negative sixth lens having a concave surface toward the object side. Conditional Formula (1) related to the combined focal length f12 of the first lens and the second lens and the focal length f of the entire lens system is satisfied:&#x2212;5&#x3c;12/&#x3c;&#x2212;2&#x2003;&#x2003;(1).

Imaging lens and imaging apparatus

An imaging lens is constituted by, in order from the object side to the image side: a negative first lens having a concave surface toward the image side; a positive second lens having a convex surface toward the image side; a negative third lens having a concave surface toward the image side; a positive biconvex fourth lens; a positive biconvex fifth lens; and a negative sixth lens having a concave surface toward the object side. Conditional Formula (1) related to the radius of curvature R3 of the surface of the second lens toward the object side and the focal length f of the entire lens system is satisfied:3/&#x3c;0&#x2003;&#x2003;(1).

An imaging lens includes, in order from the object side to the image side: a first lens having a negative refractive power and a concave surface toward the image side; a positive second lens having a negative refractive power; a third lens having a positive refractive power and a convex surface toward the image side; a fourth lens having a convex surface toward the image side; a fifth lens having a positive refractive power and a convex surface toward the image side; and a sixth lens having a negative refractive power and a concave surface toward the object side. Predetermined conditional formulae related to first lens, the second lens, and the third lens are satisfied.

An imaging lens is constituted by, in order from the object side to the image side: a first lens having a negative refractive power and a concave surface toward the image side; a second lens having a negative refractive power; a third lens having a positive refractive power and a convex surface toward the image side; a fourth lens having a negative refractive power and a concave surface toward the image side; a biconvex fifth lens which is cemented to the fourth lens; and a sixth lens having a negative refractive power and a concave surface toward the object side. Conditional Formula (1) below is satisfied:&#x2212;2.1&#x3c;3&#x3c;&#x2212;1.2&#x2003;&#x2003;(1).

An imaging lens is constituted by, in order from the object side to the image side: a first lens having a negative refractive power and a concave surface toward the image side; a second lens having a negative refractive power; a third lens having a positive refractive power and a convex surface toward the image side; a fourth lens having a negative refractive power and a concave surface toward the image side; a biconvex fifth lens which is cemented to the fourth lens; and a sixth lens having a negative refractive power and a concave surface toward the object side. Conditional Formula (1) below is satisfied:&#x2212;1.05&#x3c;12/&#x3c;&#x2212;0.8&#x2003;&#x2003;(1).

An imaging lens includes, in order from the object side to the image side: a negative first lens; a positive second lens; a positive third lens; a negative fourth lens; a positive fifth lens; a positive sixth lens; and a negative seventh lens. In the imaging lens, Conditional Formula (1) related to the radius of curvature Rof the surface of the first lens toward the image side and the focal length f of the entire lens system and Conditional Formula (2) related to the radius of curvature Rof the surface of the second lens toward the object side and the focal length f of the entire lens system are satisfied.1&#x3c;2/&#x2003;&#x2003;(1)4&#x3c;3/&#x3c;30&#x2003;&#x2003;(2).

An imaging lens is composed of a first lens having a negative meniscus shape with a convex surface on the object side, a negative second lens, a positive third lens, an aperture stop, a negative fourth lens, and a positive fifth lens disposed in order from the object side. The fourth and the fifth lens are cemented with an interface which is convex on the object side and has an aspherical shape. If the radius of curvature is taken as R9 and the focal length of the entire system is taken as f, the imaging lens satisfies a conditional expression given below:1.0&#x3c;9/&#x2003;&#x2003;(1).

Wide-angle imaging lens and imaging apparatus

An imaging lens substantially consisting of a first lens group, a stop, and a second lens group in this order from the object side, the first lens group includes at least a positive lens, a negative meniscus lens with a convex surface toward the object side, a biconcave negative lens, and a cemented lens substantially constituted by two lenses, which are a positive lens and a negative lens, in this order from the object side; the second lens group includes at least a first positive lens with a convex surface toward the image side, a cemented lens substantially constituted by two lenses, which are a positive lens and a negative lens, and a second positive lens with a convex surface toward the image side, in this order from the object side; and a predetermined conditional expression is satisfied.

An imaging lens formed of 4 lenses, in which a negative first lens having a meniscus shape with a convex surface on the object side, a biconvex positive second lens, a negative third lens having a concave surface on the image side, and a positive fourth lens having a convex surface on the object side, arranged in order from the object side, and the imaging lens satisfies conditional expressions (1): L12/f&#x3c;0.82; (2): 2.3&#x3c;L12&#xd7;R2F/f&#x3c;10.0; (5): &#x2212;1.3&#x3c;f1/f&#x3c;&#x2212;0.9; and (6): 48&#x3c;v1 simultaneously, where, L12 is the air equivalent distance between the first lens and the second lens, f is the focal length of the entire lens system, R2F is the radius of curvature of the object side lens surface of the second lens, f1 is the focal length of the first lens, and v1 is the Abbe number of the first lens with respect to the d-line.

Imaging lens and imaging apparatus using the same

An imaging unit images a subject having an unevenness pattern on a surface. The imaging unit includes: a surface light source that emits with a constant output illumination light illuminating the surface of the subject; an imager that receives reflected light reflected by the surface of the subject; and a beam splitter that is arranged at a location at which the illumination light emitted from the surface light source and the reflected light incident on the imager intersect with each other. The illumination light emitted from the surface light source is incident on the surface of the subject via the beam splitter. The reflected light reflected by the surface of the subject is incident on the imager via the beam splitter. The illumination light incident on the surface of the subject includes parallel light that is perpendicularly incident on the surface of the subject, and diffused light.

Imaging unit and coin identifying apparatus

An imaging lens includes: a first lens with a meniscus shape having a concave surface facing an object side; a second positive lens; a third negative lens with a meniscus shape having a convex surface facing an image side; and a fourth negative lens. The first to fourth lenses are arranged in this order from the object side. The imaging lens is configured such that a normal line of an object-side surface of the fourth lens at a point where the outermost light beam of an on-axis light flux passes intersects the optical axis on the image side of the object-side surface.

Growing community of inventors

Saitama, Japan

Masao Mori